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Differences in topsoil C storage among cultivated, reforesting, and natural forest ISCN-NLCD sites are consistent across ecoregions (total n = 12,238). Plot shows the mean and SE for each ecoregional division and land use. Annotations at left indicate significance of multiple comparisons (P < 0.05) among abbreviated land uses (C, cultivated; NF, natural forest; RF, reforesting).
